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Timmy , why not just use an isolator and then that wouldn't involve trying to determine the breakdown voltage of a filament transformer's insulation ?
Yes , your not likely to find one with the connectors you need , since I don't ever recall seeing one for the 3gp1 style tubes (this is likely if , as you say , the heater and cathode are already internally connected in that CRT) but if you were to get an isolator and wire it up with the right connectors this would likely allow you to use your different CRT without modifying the TV's circuits at all .
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